B - Operations – Transporting – 41 – F
Patent
B - Operations, Transporting
41
F
B41F 33/00 (2006.01) B41F 13/00 (2006.01) B41F 13/004 (2006.01) B41F 13/008 (2006.01) B41F 13/14 (2006.01)
Patent
CA 2197036
The rotating printing machine comprises several printing stations in which the form cylinder (16) of each printing station (1,2,3) is driven directly by an asynchronous vectorial electric motor (26/36) controlled by an electronic circuit (101) for monitoring and control of the angular position (a1), at a command value (pLl, 2, 3(t)) that changes over time and is received from a central electronic calculating station (10) for the synchronization of stations with one another. More particularly, the cylinder/axle/rotor assembly (16/65/26) of at least one station can be moved in axial translation for the correction of the lateral registry of the form(s) of the cylinder. In addition, the machine comprises an arrangement (20-23) that reads registry marks (5) printed by each station, and establishes the possible lateral (dl1,2,3) and longitudinal (dL1,2,3) registry error for each station (1,2,3). Each lateral error (dl1,2.3) is then applied to the electronic control circuit (15) of an electric motor (25) of the corresponding station that controls, by means of a mechanism (35), the axial position of the rotor/axle/cylinder assembly (16/65/26). Each longitudinal registry error (dL1,2,3) is added directly to the cylinder position command (pL1,2,3(t)) of the corresponding station.
Branas Jose
Rota Daniel
Bobst S.a.
Smart & Biggar
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